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My Demi-SYS drivetrain is a work in progress but I will say that the Tanpan is working beautifully. 9-Speed is the last time Shimano road & mountain groupsets played together interchangeably but because 10-speed road didn't change the pull ratio from 9-speed road that Tanpan that's intended to combine a 10-speed Brifter with a 10/11-speed mountain bike clutch derailleur works great with 9-Speed mountain.
The Tanpan isn't cheap, but I had a 9-Speed XTR shifter that's been sitting in a drawer for ages and that Tanpan was certainly a relatively less expensive way to get XTR-level shifter quality. It has 9-clicks at 10-speed spacing but that doesn't matter because I'm running less cogs anyways.
I was running 5-cogs but using a Dyna-SYS cassette where the lower gears are all clustered in 2s the jump from 3rd to 4th was HUGE. It shifted but it wasn't pretty. Now running 7-cogs with a 15-36t and a 26t/32t narrow-wide chainring selection up front.
It's been a fun project. Short cage Zee rear derailleur and BEAUTIFUL chainlines.
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